Vehicle brake



Oct 4, 1932. F. E. WINCHESTER ET AL 1,881,009

VEHICLE BRAKE Filed Oct. 9, 1930 5 Sheets-Sheet 1 By @Mm Allomcy 3 Sheets-Sheet 2 Inventors A Ilomey F d w a w 1 W WW p W 3 M w J am .7 .F J n m Oct. 4, 1932. F. E. WINCHESTER ET AL VEHICLE BRAKE Filed Opt. 9. 1930 Oct. 4, 1932. r F. E.- WINCHESTER ET AL 1,881,009

VEHICLE BRAKE Filed Oct. 9, 1950 S'Sheets-Sheet 5- a J 7 6 I/ I i Fa 6'. v1 j I InuenlorS Thom as M Allomey substantially onythe line 77 of Figure 1.

Patented Oct. 4, 1932 UNITED STATES.

PATENT OFFICE F. EARL wmcnnsrnn Am EDGAR 1a. THOMAS, or CONNERSVILLE, INDIANA VEHICLE BRAKE Application filed October 9, 1930. Serial No. 487,580.

This invention relates to certain new and 1 useful improvements in brakes and has more A primary object of. the invention is to tion with the accompanying drawings, whereprovide a brake having a plurality of brake shoes adapted to uniformally contact with thebrake drum to present a braking surface of 90 per cent or more'as compared to the average type of brake which aflords to 7 0- percent of braking surface, inasmuch as the power in such types of brakes is applied at one end of the shoe,"which does not effect a uniform contact. Y

A still further object of the invention is to provide a brake of this character, which, after thelinings are burned in or shaped to the exact diameter of the brake drum, need only be adjusted to a 0.005 clearance at any -point, whereby may be obtained a uniform clearance at the entire circumference of the brake, and which willnot require any further adjustments until the linings are worn out, except adjustments of the foot pedal itself,

' in case the pedal reaches the full travel and stops on the toe board. r 7

Other objects and advantages of the invention will become apparent during a study of the following description, taken in connecdevice, certain partsibeing shown broken .m away and in section. y

F1gure 2 1s a vertical sectional view, taken rotatable ring. V

Figure 5 is a bottom plan view ofa segmental brake shoe; 1

Figure v6 isa top plan view thereof, Figure 7 is a detail sectional view, taken Figure 8 is an elevational view of a cam forming part of the invention.

Figure 9 isa view of a detail. With reference more in detail to the drawi'ngs, it will be seen that 5 designates a brake Figure I isa plan view of the improved drum, Within Which is arrang d a plurality of brake shoes, designated generally by the reference character 6.

The brake shoes are segmental or'arcuate, and are so arranged within the drum 5 as to define a somewhat substantially annular brake shoe. 7

Each of the segmental brake shoes 6 are identical in construction, and preferably, in

the contemplation of the invention there are Q five of such segmental brake shoes 6. Each of the brake shoes 6 is substantially channel shaped in cross section and open at its opposite ends. The sides of the brake shoes are designated by the reference character 7, and the top or connecting web between the walls 7 designated by the reference character 8. Each of the brake shoes 6 is pivotally mounted, at one end thereof on a stud bolt 9. The

stud bolts 9 are carried by an end plate 10,nor- I mally closing the open side of the brake drum 5. The studs 9 are arranged in circumferential spaced relation on the'plate 10 and extend inwardly of the drum 5. The plate 10 acts as'a support for the brake and also as a dust and grease guard. The plate 10 is adapted to be mounted on the axle of the vehicle, in any suitable or well known manner for supporting the brake. The stud bolts 9 are secured at one end to the plate 10, in any suitable manner.

The stud 9 extends through the transversely aligned elongated openings 11, formed in the sides 7 of the brake shoe at one end of the brake shoe.

On the free end of thestud 9 is a suitable washer 12, and a suitable pin 13 of the shape and construction shown in Figure 9 of the drawings, engages the free end of the stud, in

' a manner similar to a. cotter pin, for retainthe lips 15 of the shoes are engaged by the tongues or. clips 14 of the next adjacent shoe which makes for a continuous brake shoe, the

V 'entire surface of the brake drum. The lips or flanges 15 are of course of such a width as to extend between the sides 7 and between the clips 14L and the web 8 of the-next adjacent brakeshoe. j v

i Arranged withinthe brake'drum 5 and arranged within the confines of the annular brake-shoe formed by the Segmental brake shoes 6 is a ring 16. The ring 16 has secured thereto a plurality of circumferentially 'spaced substantially U-shaped brackets 17.

The brackets 17 have flanged ends or lugs 18," spot Welded or otherwise secure'd'to the 7 ring '16 as at 19. f

There is one of such brackets 17 for each of the segmental brake shoes 6,and the brackets 17 are so arranged on the drum as to be adjacent thepivoted ends of the brake shoes 6. Carried by each of the brackets 17 .is a

cam member; which includes a shank portion-'19, and a somewhat shell like head 20.

The head 20 extends inwardly between the side walls 7 of the brake shoe and at the opposite ends thereof the head 20 is providedwith suitable openings for accommodating a studbolt 9, forpivotally supporting the head 20. Theshank 19 of the cam is are I ranged in thebracket17, and is retained in said bracket against rattling through the medium ofa spring 21, which extends into a '7 suitable socket providedin the shank 19 and bears against an intermediate portion'of the bracket 17. The-head 20 of the cam memberis provided with a cam face 22, adapted to bear against the inner'side of the wear face of'the brake shoe, when the cam memberis rocked in a manner to be hereinafter made manifest.

- The segmental brakeshoes. 6 are held rigidagainst the cam faces 22, ofthe. cam, members when the shoes are in a, released. po ition, that is, ina position out of engagement with the brake drum, through the medium of, flat steel, springs 23,which extend through the heads 20,0f the cams, the intermediate portion of the springs 23 hearing against the bolts 9, and the ends of the springs engaged with retaining membersfQ, arrangedin the shoes 6, said lugs 24 being weldedor otherwise secured at its ends .to the walls 7 of they "Abracket '17 similar to thebrackety17 is. also secured tothe'ring 16. An operating shaft 25 is adaptedto be operativelyconnected to the brake pedal of the vehicle, has one'endportion journalled ina bearing 26,

' carried by the plate 10, and extends inward- 27 connected to the ring 16, rotate the ring 16 in asuit'able direction, which in turn will rocli the's'cani simultaneously, thus forcing the pivoted ends of the brake shoes into frictional contact with the peripheral walls of the brake drum 5 and the floatin or free ends of the "brake 'shoes being :operatively connected withthepivot'ed end of the'next adj acentbrake-shoe will also force said floatingend of the brake shoes to be moved into frictional engagement with the peripheral wall 'ofthe brake drum, so that the web or top portion 8- of each brake'shoe for the entire length .of the brake shoe-.will bebrought into frictional 1 engagement .with the periphcry; of the drum, thus insuring a uniform.

contact of the brake shoes ith the drum, in

applying a braking a ction f Of course, the web or top portion 8 of each of the brake shoes exteriorly of the brake shoewill be p-rovided with a suitable asbestos:onother-lining29, such; as'is used for brake; lining purposes. 7

' From-the foregoing then,,it will be seen that each of 'the brake shoes 6 will be simul-- taneously moved into and out of frictional engagement ;with the periphery of the brake drum, thus insuring a positive and efficient brake action. 7 It will also be apparent-thata.

brake embodying the features-of the present invention is comparatively simple in construction, and at thesame time will insure the uniform contact with the, brake drum, the segmental shoe arranged to provide an annular brake shoe for; contact with substantially the. entire peripheral Wall of the drum aifording greater braking surface :than has heretofore been obtained.

'f' Even thoughl have herein. shown and described the. preferred embodiment of my in vention, it is to be understood that the same is susceptible to changes fully comprehended by the-spirit of the invention and the scope of the appended-claims.

What isfcl'aimed as new ist V V 1. A brake'including in'combination a circular arrangement of brake shoes each of which is provided'at one end with a tongue, and at-its other end with a' clip forreceiving the tongue onlthe. proximate end of anadjacent brakeshoe, each of said shoes beingalso pivoted adjacent that end thereof provided with the tongue, a ring concentricto said cir; cular series of -brake.shoes,- cam means connecting the pivots of said brakev shoes with said ring,and, means for'actuating said ring for moving said brake shoes radially into and out of braking position.

2. A brake including in combination a drum, a circular series of brake shoes arranged in the drum, each of said shoes being provided at one end with a tongue, and at its other end with a clip for receiving the tongue on the proximate end of an adjacent brake.

shoe, pivot means for each shoe adjacent one end of the shoe, a cam member rotatable aboutthe axis of the pivot and including a shank, a ring arranged within the confines of said brake shoes, and having a pivotal connection with the shank of said cam, and means for rotating said ring.

31A brake including in combination a circularseries of brake shoes each of which is provided at one end with a tongue, and at its other end with a clip for engaging the tongue on the proximate end of an adjacent brake shoe, means for pivotally mounting the brake shoes adjacent one end thereof, said means including a bolt extending transversely of each brake shoe, cams rotatable about said bolts engageable with the brake shoes, and spring means engaging the cams and the brake shoes for urging said brake shoes into engagement with the faces of the said cams when the shoes are in a retracted position, and means for simultaneously projecting said shoes radially into braking engagement with said drum. 7

In testimony whereof we afiix our signatures.

F. EARL WINCHESTER.

EDGAR R. THOMAS. 

